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Re: 11th specimen of Archaeopteryx
Jason Brougham <email@example.com> wrote:
> The earliest utility of climbing into trees may have been in roosting,
> because foraging in trees may require better adaptations to be
> efficient (though Jeholornis somehow did swallow dozens of gymnospem seeds).
Possibly _Jinfengopteryx_ too.
Foraging seeds from cycads or bennettitaleans would require no
perching adaptations, and minimal climbing adaptations. A proto-bird
scaling a cycad trunk might be analogous to a dromaeosaur grappling
with large prey using all four limbs.
> As I mentioned earlier the newest paper (Prieto-Marquez, Bolortsetseg, and
> Horner , 2011) places the Archaeopteryx as a sister taxon > to Jeholornis.
I think I'd prefer to see more avialan taxa (like enantiornitheans) in
the analysis before I'm confident in a _Archaeopteryx_-_Jeholornis_
clade. However, if this does show up in future analyses, then it
might be an opportunity to resurrect the name Sauriurae (or Saururae,
to use the original spelling) for a clade that includes
archaeopterygids and jeholornithids but not crown birds.
> Whether Jeholornis had a reversed hallux or not is apparently a matter of
AFAIK, metatarsal I is straight and the hallux is fairly high, as in
_Archaeopteryx_. If so, _Jeholornis_ could not have had a reversed
hallux suitable for grasping.